US20060037036A1 - Remote control method of home network and system thereof - Google Patents

Remote control method of home network and system thereof Download PDF

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Publication number
US20060037036A1
US20060037036A1 US10/520,399 US52039905A US2006037036A1 US 20060037036 A1 US20060037036 A1 US 20060037036A1 US 52039905 A US52039905 A US 52039905A US 2006037036 A1 US2006037036 A1 US 2006037036A1
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Prior art keywords
remote
upnp
home network
gena
soap
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US10/520,399
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English (en)
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Ku-Bong Min
Sung-Joon Ahn
Min-Seok Kang
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LG Electronics Inc
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LG Electronics Inc
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Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AHN, SUNG-JOON, KANG, MIN-SEOK, MIN, KU-BONG
Publication of US20060037036A1 publication Critical patent/US20060037036A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2803—Home automation networks
    • H04L12/2816—Controlling appliance services of a home automation network by calling their functionalities
    • H04L12/2818—Controlling appliance services of a home automation network by calling their functionalities from a device located outside both the home and the home network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
    • H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/51—Discovery or management thereof, e.g. service location protocol [SLP] or web services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]

Definitions

  • the present invention relates to a home network, and in particular to a remote control method of a home network and its system.
  • a UPnP Universal Plug and Play
  • a UPnP-based network system includes plural UPnP devices providing a service and CPs (Control Points) controlling the plural UPnP devices.
  • the CP an entity for controlling various devices such as UPnP devices, discovers various UPnP devices according to a key input of a user, describes functions of the discovered UPnP devices, and controls the UPnP devices.
  • the UPnP device is an apparatus such as a PC (personal computer), network equipment, a peripheral apparatus such as a printer, an audio/video apparatus and electronic appliances, which are connected to the home network.
  • the UPnP device informs a CP of an event and can control a device and detect a state of the device by using a web page by providing a presentation page to the CP.
  • a UPnP protocol stack based on a UPnP device architecture version 1.0 will now be described with reference to FIG. 1 .
  • FIG. 1 is a view showing a UPnP protocol stack.
  • a UPnP protocol stack based on a conventional UPnP device architecture version 1.0 includes a network layer 114 including an IP (Internet Protocol); a transport layer 113 including a UDP (User Datagram Protocol) and a TCP (Transmission Control protocol); a presentation/session layer 112 including protocols of HTTP, XML (Extensible Markup Language) (not shown), SOAP (Simple Object Access Protocol) and SSDP (Simple Service Discovery Protocol), and an architecture such as a GENA (Generic Event Notification Architecture); and an application layer 111 including related information such as a UPnP device, a forum and a vender, etc.
  • IP Internet Protocol
  • UDP User Datagram Protocol
  • TCP Transmission Control protocol
  • presentation/session layer 112 including protocols of HTTP, XML (Extensible Markup Language) (not shown), SOAP (Simple Object Access Protocol) and SSDP (Simple Service Discovery Protocol), and an architecture such as a GENA (Generic Event Not
  • a communication method between the CP and devices includes an addressing step that IP addresses are allocated to the devices; a discovery step that the CP discovers an existence of the devices; a function description step that the CP describes information of the devices and a service supported by the device; a control step that the CP calls the service of the device; an eventing step that the device informs the CP of its state change; and a presentation step that the device displays its state and control information.
  • FIG. 2 is an operation state view showing a discovery process of a UPnP network.
  • FIG. 2 is a view showing a state that a UPnP device 221 multicasts an advertising message to UPnP CPs 211 and 212 and a state that a UPnP device 222 responds when CP 213 transmits a search message to the UPnP devices 221 and 222 .
  • the CP discovers a UPnP device by using a SSDP (Simple Service Discovery Protocol).
  • SSDP Simple Service Discovery Protocol
  • the device 221 multicasts an advertising message to the CP, whereby the CPs 211 and 212 confirms an existence of the UPnP device(s) on the basis of the multicast message from the device 221 .
  • the CP 213 when the CP 213 is connected to a UPnP network, the CP 213 multicasts a search message to a device.
  • the device 222 receiving the search message transmits its information to the CP 213 through a unicast.
  • a SOAP Simple Object Access Protocol
  • the GENA is used to receive a state event of the devices.
  • UPnP device architecture version 1.0 it is assumed that every element of a home network is located at a local network, so a connection service at a remote area is not considered.
  • the CP exists at an external network and tries to access the home network, the CP should be able to use a UPnP protocol mechanism even at the external network.
  • a terminal connected at a remote area is a wireless terminal, a limited calculation capability, a memory unit, a display capability and a network environment of the wireless terminal should be considered.
  • the conventional IP network cannot discover the UPnP device(s) of a home network through a UPnP search at a remote area because the IP network does not support a multicast effectively.
  • a TTL (Time To Live) value of an IP header of a packet to be multicast is limited to four in order to prevent network confusion caused by a multicast packet.
  • frequent event message transmission is incongruent in a radio environment because the conventional UPnP architecture version 1.0 has no special consideration for a radio terminal environment.
  • a presentation page used in a wire environment needs to be reconstructed in consideration of the radio environment because of the limitation of a display unit. Since stacks of TCP/IP and HTTP may not be used depending on a kind of a terminal in case that a remote access CP is loaded in a wireless terminal, a method for coping with this situation is needed. In conclusion, in a UPnP home network connection at a remote area, a proxy acting for every function of the CP in the home network and an appropriate message conversion are needed in order to solve the described problems.
  • UPnP Universal Plug and Play
  • a remote control method of a home network comprising the steps of respectively setting a CP controlling devices connected to a home network system at a home agent in the home network system and at a remote CP of a remote terminal; and connecting the CP set at the home agent and the CP set at the remote CP through a specific channel.
  • a remote control system of a home network including a home network; a home agent communicating with devices connected to the home network and having a function of a CP used at the home network; and a remote CP set at a remote terminal and having a function of the CP.
  • the CP of the home agent and the CP of the remote CP are connected through a specific channel.
  • a remote control system of a home network including a UPnP (Universal Plug and Play)—based home network; a home agent communicating with UPnP devices in the home network and having a function of a UPnP CP used at the UPnP-based home network; a remote CP set at a remote terminal and having a function of the UPnP CP; and a user interface unit installed at the remote terminal and providing an interface to a user.
  • the UPnP CP of the home agent and the UPnP CP of the remote CP are connected through a specific channel.
  • FIG. 1 is a view showing a UPnP protocol stack.
  • FIG. 2 is a view showing a state that a UPnP device multicasts an advertising message to a UPnP CP and a state that the UPnP device responds when CP transmits a search message to the UPnP device.
  • FIG. 3 is a block chart showing a structure of a remote control system of a UPnP-based home network according to a first embodiment of the present invention.
  • FIG. 4 is a view showing a structure of a home network remote control system to which a UPnP CP stack having stacks of TCP/IP and HTTP is applied according to a second embodiment of the present invention.
  • FIG. 5 is a signal flow chart of the home network remote control system to which the same UPnP CP stack as of the FIG. 4 is applied.
  • FIG. 6 is a view showing a home network remote control system to which a UPnP CP stack having WAP (Wireless Application Protocol) stack instead of stacks of TCP/IP and HTTP is applied according to a third embodiment of the present invention.
  • WAP Wireless Application Protocol
  • FIG. 7 is a signal flow chart of a home network remote control system to which the same UPnP CP stack as of FIG. 6 is applied.
  • FIG. 8 is an exemplary view showing case that a function of a home agent and a remote CP is distributed so that the home agent performs most of UPnP CP functions and shows only an interface to the remote CP.
  • a remote control method of a home network and its system capable of easily and remotely controlling a device connected to a UPnP-based home network at a remote area by respectively setting a UPnP CP at a home agent and at a remote CP of a remote terminal, and connecting the UPnP CP set at the home agent and the UPnP CP set at the remote CP through a specific channel, will now be described in detail with reference to FIGS. 3 to 8 .
  • FIG. 3 is a block chart showing a structure of a remote control system of the UPnP-based home network according to a first embodiment of the present invention.
  • a function of a UPnP CP used at the UPnP-based home network is distributed to a home agent (HA) and to a remote CP 331 .
  • HA home agent
  • a local CP For example, a local CP, a UPnP CP used at the UPnP-based home network monitors whether a remote CP is enabled, and determines whether the local CP transfers its authority for controlling a UPnP device to the remote CP according to the monitoring result. That is, the local CP receives state information of the remote CP, and determines a range of the authority transfer on the basis of the received state information.
  • the state information means information about a processing capability of a remote terminal.
  • the remote CP checks whether it is possible to be connected with the local home network, then, is coupled with the home network on the basis of the check result and transmits its state information to the local home network when the remote CP is connected to the home network. That is, the remote CP controls the device through the local CP.
  • a remote control system of the UPnP-based home network includes a UPnP-based home network 310 ; a home agent 320 including a function of a UPnP CP (local CP) used at the home network 310 , and being a UPnP protocol process unit communicating with the UPnP devices in the home network 310 ; a remote CP 331 including a function of the UPnP CP, and set at a remote terminal (e.g., mobile terminal equipment); and a user interface unit 332 set at the remote terminal, and providing an interface to a user.
  • the remote terminal means a device (e.g., a wireless terminal or a mobile terminal positioned) at a remote area, which is not connected with a local network to which UPnP devices are connected.
  • a device search and an eventing are processed in a local home network by using an IP multicast. Also, user interface output should be performed at a remote terminal.
  • a function of a UPnP CP is distributed to the home agent 320 (HA) and the remote CP.
  • a function of the UPnP CP is distributed to the home agent 320 in the home network and the outside remote CP 331 , and then, the UPnP CP distributed to the HA 320 and the UPnP CP distributed to the remote CP 331 are made a one to one connection through a specific channel (e.g., a secure channel).
  • a UPnP event message is transmitted through an IP unicast by using a GENA.
  • the event message is not directly transmitted to the remote CP, but the HA 320 receives the message, moderates the received event message.
  • the HA 320 may transmits the moderated event message to the remote CP 331 or may be constructed so that the remote CP 331 can obtain the event message from the HA 320 by polling. This Is useful when an event message is generated frequently.
  • a UPnP protocol stack includes basic internet protocols 112 to 114 , a section defined at a UPnP device architecture, and a section 111 defined by being specialized according to a kind of each equipment and a vendor. Accordingly, the HA 320 and the remote CP 331 can receive a basic service of UPnP devices through a UPnP API defined at each device architecture.
  • the UPnP service (e.g., UPnP API) defined in the UPnP device architecture is not sufficient to use functions specialized by equipment and manufacturers.
  • each UPnP device is specialized, or specific functions of a UPnP device is separately constructed as a component, thereby being installed for use whenever necessary.
  • an optimized UPnP control point function can be implemented, and a minimized storage space of a remote terminal can be used as well. For instance, as shown in FIG. 4 , a function of the home agent and the remote terminal can be distributed in case that the remote terminal has both stacks of TCP/IP and HTTP.
  • FIG. 4 is a view showing a structure of a remote control system of the home network to which a UPnP CP stack having stacks of TCP/IP and HTTP is applied according to a second embodiment of the present invention.
  • the home agent 410 performs a function using an IP multicast, which is a part of functions of a SSDP and a GENA.
  • the remote CP 420 performs functions of a series of a SOAP, a GENA and a user interface including functions of a device/vendor specific component 421 and a UPnP API (Application Program Interface) 422 .
  • UPnP API Application Program Interface
  • the function of which the home agent 410 takes charge is transferred to the remote CP 420 by a defined vendor specific protocol.
  • the remote CP 420 performs device search and eventing functions, which are a part of functions of the remote CP, through the HA 410 , and performs other functions by directly accessing the device. That is, if a distributing environment technology is used, the UPnP API of the remote CP 420 processes a function performed at the home agent as if the function is processed at a local.
  • an application program made out by using the UPnP API operates without regard to a distributing process of UPnP stacks 112 to 114 of FIG. 1 implemented in order to provide the API. That is, the remote terminal can control the UPnP devices with the same function as that of the UPnP CP in the home network through a UPnP CP set at the remote CP at a remote area.
  • FIG. 5 is a signal flow chart of a remote control system of a home network to which the same UPnP CP stack as that of FIG. 4 is applied.
  • the home agent 410 discovers UPnP devices in the home network through the UPnP device and the UPnP search process, and stores information related to the discovered devices.
  • the home agent 410 transmits the stored information to the remote CP 420 .
  • the remote CP 420 directly requests a pertinent UPnP device for a presentation page of a device to be controlled based on a device list of the stored information. At this time, the pertinent UPnP device transmits a HTLM page corresponding to the request to the remote CP 420 .
  • the remote CP 420 transmits a UPnP event subscription request in order to receive an event message of the UPnP device.
  • the home agent 410 receives the event message transmitted from the pertinent UPnP device by transmitting the UPnP event subscription request to the pertinent UPnP device.
  • the home agent summarizes the event message.
  • the remote CP 420 receives the summarized event message from the HA 410 by performing periodical polling. According to this, when the remote CP 420 tries to control the pertinent UPnP device, the remote CP 420 composes the SOAP message, directly requests the pertinent UPnP device and receives a response message.
  • FIG. 6 is a view showing a remote control system of a home network to which a UPnP control point stack having a WAP (Wireless Application Protocol) stack 521 instead of stacks of TCP/IP and HTTP is applied according to a third embodiment of the present invention.
  • WAP Wireless Application Protocol
  • the home agent 510 performs a function using an IP multicast, which is a part of functions of the SSDP and the GENA, and a WAP gateway function 511 converting the SOAP* and a GENA* messages defined in a WML (Wireless Markup Language) into the SOAP and the GENA messages in an existing XML (Extensible Markup Language), and carrying the message on a HTTP (Hypertext Transfer Protocol).
  • WML Wireless Markup Language
  • HTTP Hypertext Transfer Protocol
  • the WAP gateway function can exist in an external network. That is, the WAP gateway function can exist between the home agent 510 and the remote CP 520 by separating the WAP gateway from the home agent 510 to the outside.
  • FIG. 7 is a signal flow chart of a home network remote control system to which the same UPnP CP stack as of FIG. 6 is applied.
  • the home agent 510 discovers UPnP devices in the home network through a UPnP device and a UPnP search process, and stores information related to the discovered UPnP device.
  • the home agent 510 transmits the stored information to the remote CP 520 .
  • the remote CP 520 requests the home agent 510 for a presentation page of a device to be controlled based on a device list of the received information. At this time, the home agent 510 requests the device to be controlled by the remote CP 520 for a presentation page.
  • the UPnP device to be controlled by the remote CP 520 transmits a HTML page to the home agent 510 according to the request of the home agent 510 .
  • the home agent 510 receives the HTML page from the UPnP device, converts the received HTML page into a WML document, and transmits the converted WML document to the remote CP 520 .
  • the remote CP 520 transmits an event subscription request signal to the home agent 510 in order to receive the event message of the UPnP device.
  • the home agent 510 requests a pertinent UPnP device for a UPnP event subscription. At this time, the home agent 510 receives the event message transmitted from the UPnP device according to the UPnP event subscription request.
  • the home agent 510 summarizes the received event message, and transmits the summarized event message to the remote CP 520 with a predetermined time interval.
  • the remote CP 520 composes a WML version of the SOAP* message and transmits the composed message to the home agent in order to control the UPnP device.
  • the home agent 510 converts the SOAP* message defined in the WML version into the SOAP message in XML (Extensible Markup Language), and transmits the converted SOAP message to the UPnP device. According to this, the UPnP device transmits a response message to the home agent 510 .
  • the home agent 510 converts the response message transmitted from the UPnP device into a WML format, and transmits the converted response message to the remote CP 520 .
  • FIG. 8 is an exemplary view showing a case of distributing functions of a home agent 610 and a remote CP 620 so that the home agent 610 performs most of CP functions 611 and 612 and shows only an interface to the remote CP 620 . That is, the home agent 610 generates its operation result in WML, provides the result to the remote CP 620 and receives a pertinent command In a WML form. In this case, the home agent 610 operates as a kind of a UPnP CP proxy.
  • the present invention distributes a function of a UPnP CP to a remote CP in a mobile terminal and a home agent in a home network, Therefore a flexible correspondence to various UPnP devices and a remote terminal is possible, thereby the present invention can achieve the effects below.
  • an operation of a remote terminal can be optimized by differently corresponding an implementation method according to a performance degree of the remote terminal.
  • the latest service can be provided on each UPnP device by dynamically downloading a specialized component to every certain UPnP device.
  • a bandwidth of a wireless network can be stored by using a moderation function of an event message.
  • a standard of an existing UPnP device architecture version 1.0 can be maintained by respectively setting the UPnP CP function at a home agent and at the remote CP, even though various ways of implementation are provided.
  • the UPnP CP function which follows the UPnP device architecture version 1.0 standard and supports various service controls without being restricted by various limitations of a radio mobile communication environment, can be implemented in a remote terminal (mobile terminal) positioned at a remote area. That is, a remote control method of a home network and its system according to the present invention can control devices connected to a home network system at a remote area by setting the UPnP CP provided to the UPnP-based home network system at a home agent in the UPnP home network system and at a remote control point of a remote terminal respectively.
US10/520,399 2002-07-10 2003-06-30 Remote control method of home network and system thereof Abandoned US20060037036A1 (en)

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KR1020020040079A KR20040005503A (ko) 2002-07-10 2002-07-10 홈 네트워크의 유피엔피 기능 분산 시스템
KR10-2002-0040079 2002-07-10
PCT/KR2003/001289 WO2004008694A1 (en) 2002-07-10 2003-06-30 Remote control method of home network and system thereof

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